W91540N SERIES
BLOCK DIAGRAM
HKS
HFI
XT XT
SYSTEM CLOCK
GENERATOR
ROW
(R1 to R4, Vx)
COLUMN
(C1 to C4)
KEYBOARD
INTERFACE
DTMF
D/A
CONVERTER
READ/WRITE
COUNTER
CONTROL
LOGIC
LOCK
MODE
LOCATION
LATCH
RAM
PULSE
CONTROL
LOGIC
ROW & COLUMN
PROGRAMMABLE
COUNTER
DATA LATCH
& DECODER
T/P MUTE
KT
DP/C5
HFO
FUNCTIONAL DESCRIPTION
C1 C2 C3 C4 DP / C5
1 23S
R1
4 5 6 F4
R2
7 89A
R3
∗/T 0 # R/P SAVE R4
F1 F2 F3
Vx
• S: Store function key
• A: Indirect repertory memory dialing function key
• R/P: Redial and pause function key
• ∗/T: ∗ in tone mode and P→T in pulse mode
• SAVE: Save function key for one-touch 32-digit memory
• F1, ..., F4: Flash function keys; F1 = 600 mS, F2 = 300 mS, F3 = 73 mS, F4 = 100 mS, and flash
pause time for each key is 1.0 mS
Note: Ln = 0, ..., 9; Dn = 0, ..., 9, */T, #, Pause.
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